<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
        xmlns="urn:ietf:params:xml:ns:clue-protocol"
        xmlns:dm="urn:ietf:params:xml:ns:clue-info"
        version="1.0"
        targetNamespace="urn:ietf:params:xml:ns:clue-protocol"
        elementFormDefault="qualified"
        attributeFormDefault="unqualified">
  <!-- Import data model schema -->
  <xs:import namespace="urn:ietf:params:xml:ns:clue-info"/>
  <!-- ELEMENT DEFINITIONS -->
  <xs:element name="options" type="optionsMessageType" />
  <xs:element name="optionsResponse" type="optionsResponseMessageType"/>
  <xs:element name="advertisement" type="advertisementMessageType"/>
  <xs:element name="ack" type="advAcknowledgementMessageType"/>
  <xs:element name="configure" type="configureMessageType"/>
  <xs:element name="configureResponse"
        type="configureResponseMessageType"/>
  <!-- CLUE MESSAGE TYPE -->
  <xs:complexType name="clueMessageType" abstract="true">
    <xs:sequence>
      <xs:element name="clueId" type="xs:string" minOccurs="0" />
      <xs:element name="sequenceNr" type="xs:positiveInteger" />
    </xs:sequence>
    <xs:attribute name="protocol" type="xs:string" fixed="CLUE"
        use="required" />
    <xs:attribute name="v" type="versionType" use="required" />
  </xs:complexType>
  <!-- CLUE RESPONSE TYPE -->
  <xs:complexType name="clueResponseType">
    <xs:complexContent>
      <xs:extension base="clueMessageType">
        <xs:sequence>
          <xs:element name="responseCode" type="responseCodeType" />
          <xs:element name="reasonString" type="xs:string"
                minOccurs="0"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <!-- VERSION TYPE -->
  <xs:simpleType name="versionType">
    <xs:restriction base="xs:string">
      <xs:pattern value="[1-9][0-9]*\.[0-9]+" />
    </xs:restriction>
  </xs:simpleType>
  <!-- RESPONSE CODE TYPE -->
  <xs:simpleType name="responseCodeType">
    <xs:restriction base="xs:integer">
      <xs:pattern value="[1-9][0-9][0-9]" />
    </xs:restriction>
  </xs:simpleType>
  <!-- SUCCESS RESPONSE CODE TYPE -->
  <xs:simpleType name="successResponseCodeType">
    <xs:restriction base="xs:integer">
      <xs:pattern value="2[0-9][0-9]" />
    </xs:restriction>
  </xs:simpleType>
  <!-- CLUE OPTIONS -->
  <xs:complexType name="optionsMessageType">
    <xs:complexContent>
      <xs:extension base="clueMessageType">
        <xs:sequence>
          <xs:element name="mediaProvider" type="xs:boolean"/>
          <xs:element name="mediaConsumer" type="xs:boolean"/>
          <xs:element name="supportedVersions" type="versionsListType"
                minOccurs="0" />
          <xs:element name="supportedExtensions"
                type="extensionsListType" minOccurs="0"/>
          <xs:any namespace="##other" processContents="lax"
                minOccurs="0"/>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <!-- VERSIONS LIST TYPE -->
  <xs:complexType name="versionsListType">
    <xs:sequence>
      <xs:element name="version" type="versionType" minOccurs="1"
        maxOccurs="unbounded"/>
      <xs:any namespace="##other" processContents="lax" minOccurs="0"/>
    </xs:sequence>
    <xs:anyAttribute namespace="##other" processContents="lax" />
  </xs:complexType>
  <!-- EXTENSIONS LIST TYPE -->
  <xs:complexType name="extensionsListType">
    <xs:sequence>
      <xs:element name="extension" type="extensionType" minOccurs="1"
        maxOccurs="unbounded"/>
      <xs:any namespace="##other" processContents="lax" minOccurs="0"/>
    </xs:sequence>
    <xs:anyAttribute namespace="##other" processContents="lax" />
  </xs:complexType>
  <!-- EXTENSION TYPE -->
  <xs:complexType name="extensionType">
    <xs:sequence>
      <xs:element name="name" type="xs:string" />
      <xs:element name="schemaRef" type="xs:anyURI" />
      <xs:element name="version" type="versionType" />
      <xs:any namespace="##other" processContents="lax" minOccurs="0"/>
    </xs:sequence>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>
  <!-- CLUE 'optionsResponse' -->
  <xs:complexType name="optionsResponseMessageType">
    <xs:complexContent>
      <xs:extension base="clueResponseType">
        <xs:sequence>
          <xs:element name="mediaProvider" type="xs:boolean"
                minOccurs="0"/>
          <xs:element name="mediaConsumer" type="xs:boolean"
                minOccurs="0"/>
          <xs:element name="version" type="versionType" minOccurs="0"/>
          <xs:element name="commonExtensions" type="extensionsListType"
                minOccurs="0"/>
          <xs:any namespace="##other" processContents="lax"
                minOccurs="0"/>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <!-- CLUE ADVERTISEMENT MESSAGE TYPE -->
  <xs:complexType name="advertisementMessageType">
    <xs:complexContent>
      <xs:extension base="clueMessageType">
        <xs:sequence>
          <!-- mandatory -->
          <xs:element name="mediaCaptures" type="dm:mediaCapturesType"/>
          <xs:element name="encodingGroups"
                type="dm:encodingGroupsType"/>
          <xs:element name="captureScenes" type="dm:captureScenesType"/>
          <!-- optional -->
          <xs:element name="simultaneousSets"
                type="dm:simultaneousSetsType" minOccurs="0"/>
          <xs:element name="globalViews" type="dm:globalViewsType"
                minOccurs="0"/>
          <xs:element name="people" type="dm:peopleType" minOccurs="0"/>
          <xs:any namespace="##other" processContents="lax"
                minOccurs="0"/>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <!-- 'ack' MESSAGE TYPE -->
  <xs:complexType name="advAcknowledgementMessageType">
    <xs:complexContent>
      <xs:extension base="clueResponseType">
        <xs:sequence>
          <xs:element name="advSequenceNr" type="xs:positiveInteger"/>
          <xs:any namespace="##other" processContents="lax"
                minOccurs="0"/>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <!-- CLUE 'configure' MESSAGE TYPE -->
  <xs:complexType name="configureMessageType">
    <xs:complexContent>
      <xs:extension base="clueMessageType">
        <xs:sequence>
          <!-- mandatory fields -->
          <xs:element name="advSequenceNr" type="xs:positiveInteger"/>
          <xs:element name="ack" type="successResponseCodeType"
                minOccurs="0"/>
          <xs:element name="captureEncodings"
                type="dm:captureEncodingsType" minOccurs="0"/>
          <xs:any namespace="##other" processContents="lax"
                minOccurs="0"/>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <!-- 'configureResponse' MESSAGE TYPE -->
  <xs:complexType name="configureResponseMessageType">
    <xs:complexContent>
      <xs:extension base="clueResponseType">
        <xs:sequence>
          <xs:element name="confSequenceNr" type="xs:positiveInteger"/>
          <xs:any namespace="##other" processContents="lax"
                minOccurs="0"/>
        </xs:sequence>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:schema>